1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-atr.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Common i2c address translator properties
8
9 maintainers:
10 - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
11
12 description:
13 An I2C Address Translator (ATR) is a device with an I2C slave parent
14 ("upstream") port and N I2C master child ("downstream") ports, and
15 forwards transactions from upstream to the appropriate downstream port
16 with a modified slave address. The address used on the parent bus is
17 called the "alias" and is (potentially) different from the physical
18 slave address of the child bus. Address translation is done by the
19 hardware.
20
21 properties:
22 i2c-alias-pool:
23 $ref: /schemas/types.yaml#/definitions/uint32-array
24 description:
25 I2C alias pool is a pool of I2C addresses on the main I2C bus that can be
26 used to access the remote peripherals on the serializer's I2C bus. The
27 addresses must be available, not used by any other peripheral. Each
28 remote peripheral is assigned an alias from the pool, and transactions to
29 that address will be forwarded to the remote peripheral, with the address
30 translated to the remote peripheral's real address. This property is not
31 needed if there are no I2C addressable remote peripherals.
32
33 additionalProperties: true
34 ...
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